mock: export ratelimiter as RateLimiter

Technically a breaking change because I changed the constructor casing but
nobody's using this outside of libp2p (yet), mostly because the type hasn't been
exported.

p2p/net/mock/mock_link.go

@@ -16,7 +16,7 @@ type link struct {
 	mock        *mocknet
 	nets        []*peernet
 	opts        LinkOptions
-	ratelimiter *ratelimiter
+	ratelimiter *RateLimiter
 	// this could have addresses on both sides.
 
 	sync.RWMutex
@@ -25,7 +25,7 @@ type link struct {
 func newLink(mn *mocknet, opts LinkOptions) *link {
 	l := &link{mock: mn,
 		opts:        opts,
-		ratelimiter: NewRatelimiter(opts.Bandwidth)}
+		ratelimiter: NewRateLimiter(opts.Bandwidth)}
 	return l
 }
 

p2p/net/mock/mock_test.go

@@ -487,7 +487,7 @@ func TestAdding(t *testing.T) {
 }
 
 func TestRateLimiting(t *testing.T) {
-	rl := NewRatelimiter(10)
+	rl := NewRateLimiter(10)
 
 	if !within(rl.Limit(10), time.Duration(float32(time.Second)), time.Millisecond/10) {
 		t.Fail()

p2p/net/mock/ratelimiter.go

@@ -5,9 +5,9 @@ import (
 	"time"
 )
 
-//  A ratelimiter is used by a link to determine how long to wait before sending
+//  A RateLimiter is used by a link to determine how long to wait before sending
 //  data given a bandwidth cap.
-type ratelimiter struct {
+type RateLimiter struct {
 	lock         sync.Mutex
 	bandwidth    float64       // bytes per nanosecond
 	allowance    float64       // in bytes
@@ -17,20 +17,20 @@ type ratelimiter struct {
 	duration     time.Duration // total delay introduced due to rate limiting
 }
 
-//  Creates a new ratelimiter with bandwidth (in bytes/sec)
-func NewRatelimiter(bandwidth float64) *ratelimiter {
+//  Creates a new RateLimiter with bandwidth (in bytes/sec)
+func NewRateLimiter(bandwidth float64) *RateLimiter {
 	//  convert bandwidth to bytes per nanosecond
 	b := bandwidth / float64(time.Second)
-	return &ratelimiter{
+	return &RateLimiter{
 		bandwidth:    b,
 		allowance:    0,
 		maxAllowance: bandwidth,
 		lastUpdate:   time.Now(),
 	}
 }
 
-//  Changes bandwidth of a ratelimiter and resets its allowance
-func (r *ratelimiter) UpdateBandwidth(bandwidth float64) {
+//  Changes bandwidth of a RateLimiter and resets its allowance
+func (r *RateLimiter) UpdateBandwidth(bandwidth float64) {
 	r.lock.Lock()
 	defer r.lock.Unlock()
 	//  Convert bandwidth from bytes/second to bytes/nanosecond
@@ -43,7 +43,7 @@ func (r *ratelimiter) UpdateBandwidth(bandwidth float64) {
 }
 
 //  Returns how long to wait before sending data with length 'dataSize' bytes
-func (r *ratelimiter) Limit(dataSize int) time.Duration {
+func (r *RateLimiter) Limit(dataSize int) time.Duration {
 	r.lock.Lock()
 	defer r.lock.Unlock()
 	//  update time